net: file_operations should be const
[linux-2.6.git] / net / mac80211 / rc80211_pid_debugfs.c
1 /*
2  * Copyright 2007, Mattias Nissler <mattias.nissler@gmx.de>
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2 as
6  * published by the Free Software Foundation.
7  */
8
9 #include <linux/spinlock.h>
10 #include <linux/poll.h>
11 #include <linux/netdevice.h>
12 #include <linux/types.h>
13 #include <linux/skbuff.h>
14
15 #include <net/mac80211.h>
16 #include "rate.h"
17
18 #include "rc80211_pid.h"
19
20 static void rate_control_pid_event(struct rc_pid_event_buffer *buf,
21                                    enum rc_pid_event_type type,
22                                    union rc_pid_event_data *data)
23 {
24         struct rc_pid_event *ev;
25         unsigned long status;
26
27         spin_lock_irqsave(&buf->lock, status);
28         ev = &(buf->ring[buf->next_entry]);
29         buf->next_entry = (buf->next_entry + 1) % RC_PID_EVENT_RING_SIZE;
30
31         ev->timestamp = jiffies;
32         ev->id = buf->ev_count++;
33         ev->type = type;
34         ev->data = *data;
35
36         spin_unlock_irqrestore(&buf->lock, status);
37
38         wake_up_all(&buf->waitqueue);
39 }
40
41 void rate_control_pid_event_tx_status(struct rc_pid_event_buffer *buf,
42                                       struct ieee80211_tx_info *stat)
43 {
44         union rc_pid_event_data evd;
45
46         evd.flags = stat->flags;
47         memcpy(&evd.tx_status, stat, sizeof(struct ieee80211_tx_info));
48         rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_STATUS, &evd);
49 }
50
51 void rate_control_pid_event_rate_change(struct rc_pid_event_buffer *buf,
52                                                int index, int rate)
53 {
54         union rc_pid_event_data evd;
55
56         evd.index = index;
57         evd.rate = rate;
58         rate_control_pid_event(buf, RC_PID_EVENT_TYPE_RATE_CHANGE, &evd);
59 }
60
61 void rate_control_pid_event_tx_rate(struct rc_pid_event_buffer *buf,
62                                            int index, int rate)
63 {
64         union rc_pid_event_data evd;
65
66         evd.index = index;
67         evd.rate = rate;
68         rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_RATE, &evd);
69 }
70
71 void rate_control_pid_event_pf_sample(struct rc_pid_event_buffer *buf,
72                                              s32 pf_sample, s32 prop_err,
73                                              s32 int_err, s32 der_err)
74 {
75         union rc_pid_event_data evd;
76
77         evd.pf_sample = pf_sample;
78         evd.prop_err = prop_err;
79         evd.int_err = int_err;
80         evd.der_err = der_err;
81         rate_control_pid_event(buf, RC_PID_EVENT_TYPE_PF_SAMPLE, &evd);
82 }
83
84 static int rate_control_pid_events_open(struct inode *inode, struct file *file)
85 {
86         struct rc_pid_sta_info *sinfo = inode->i_private;
87         struct rc_pid_event_buffer *events = &sinfo->events;
88         struct rc_pid_events_file_info *file_info;
89         unsigned long status;
90
91         /* Allocate a state struct */
92         file_info = kmalloc(sizeof(*file_info), GFP_KERNEL);
93         if (file_info == NULL)
94                 return -ENOMEM;
95
96         spin_lock_irqsave(&events->lock, status);
97
98         file_info->next_entry = events->next_entry;
99         file_info->events = events;
100
101         spin_unlock_irqrestore(&events->lock, status);
102
103         file->private_data = file_info;
104
105         return 0;
106 }
107
108 static int rate_control_pid_events_release(struct inode *inode,
109                                            struct file *file)
110 {
111         struct rc_pid_events_file_info *file_info = file->private_data;
112
113         kfree(file_info);
114
115         return 0;
116 }
117
118 static unsigned int rate_control_pid_events_poll(struct file *file,
119                                                  poll_table *wait)
120 {
121         struct rc_pid_events_file_info *file_info = file->private_data;
122
123         poll_wait(file, &file_info->events->waitqueue, wait);
124
125         return POLLIN | POLLRDNORM;
126 }
127
128 #define RC_PID_PRINT_BUF_SIZE 64
129
130 static ssize_t rate_control_pid_events_read(struct file *file, char __user *buf,
131                                             size_t length, loff_t *offset)
132 {
133         struct rc_pid_events_file_info *file_info = file->private_data;
134         struct rc_pid_event_buffer *events = file_info->events;
135         struct rc_pid_event *ev;
136         char pb[RC_PID_PRINT_BUF_SIZE];
137         int ret;
138         int p;
139         unsigned long status;
140
141         /* Check if there is something to read. */
142         if (events->next_entry == file_info->next_entry) {
143                 if (file->f_flags & O_NONBLOCK)
144                         return -EAGAIN;
145
146                 /* Wait */
147                 ret = wait_event_interruptible(events->waitqueue,
148                                 events->next_entry != file_info->next_entry);
149
150                 if (ret)
151                         return ret;
152         }
153
154         /* Write out one event per call. I don't care whether it's a little
155          * inefficient, this is debugging code anyway. */
156         spin_lock_irqsave(&events->lock, status);
157
158         /* Get an event */
159         ev = &(events->ring[file_info->next_entry]);
160         file_info->next_entry = (file_info->next_entry + 1) %
161                                 RC_PID_EVENT_RING_SIZE;
162
163         /* Print information about the event. Note that userpace needs to
164          * provide large enough buffers. */
165         length = length < RC_PID_PRINT_BUF_SIZE ?
166                  length : RC_PID_PRINT_BUF_SIZE;
167         p = snprintf(pb, length, "%u %lu ", ev->id, ev->timestamp);
168         switch (ev->type) {
169         case RC_PID_EVENT_TYPE_TX_STATUS:
170                 p += snprintf(pb + p, length - p, "tx_status %u %u",
171                               !(ev->data.flags & IEEE80211_TX_STAT_ACK),
172                               ev->data.tx_status.status.rates[0].idx);
173                 break;
174         case RC_PID_EVENT_TYPE_RATE_CHANGE:
175                 p += snprintf(pb + p, length - p, "rate_change %d %d",
176                               ev->data.index, ev->data.rate);
177                 break;
178         case RC_PID_EVENT_TYPE_TX_RATE:
179                 p += snprintf(pb + p, length - p, "tx_rate %d %d",
180                               ev->data.index, ev->data.rate);
181                 break;
182         case RC_PID_EVENT_TYPE_PF_SAMPLE:
183                 p += snprintf(pb + p, length - p,
184                               "pf_sample %d %d %d %d",
185                               ev->data.pf_sample, ev->data.prop_err,
186                               ev->data.int_err, ev->data.der_err);
187                 break;
188         }
189         p += snprintf(pb + p, length - p, "\n");
190
191         spin_unlock_irqrestore(&events->lock, status);
192
193         if (copy_to_user(buf, pb, p))
194                 return -EFAULT;
195
196         return p;
197 }
198
199 #undef RC_PID_PRINT_BUF_SIZE
200
201 static const struct file_operations rc_pid_fop_events = {
202         .owner = THIS_MODULE,
203         .read = rate_control_pid_events_read,
204         .poll = rate_control_pid_events_poll,
205         .open = rate_control_pid_events_open,
206         .release = rate_control_pid_events_release,
207 };
208
209 void rate_control_pid_add_sta_debugfs(void *priv, void *priv_sta,
210                                              struct dentry *dir)
211 {
212         struct rc_pid_sta_info *spinfo = priv_sta;
213
214         spinfo->events_entry = debugfs_create_file("rc_pid_events", S_IRUGO,
215                                                    dir, spinfo,
216                                                    &rc_pid_fop_events);
217 }
218
219 void rate_control_pid_remove_sta_debugfs(void *priv, void *priv_sta)
220 {
221         struct rc_pid_sta_info *spinfo = priv_sta;
222
223         debugfs_remove(spinfo->events_entry);
224 }